（单选题）
You executed the following command in Recovery Manager （RMAN）： RMAN> RESTORE CONTROLFILE； Which operation must you perform before this command is executed？（）
A back up the control file to trace
B bring database to the MOUNT state
C open a connection to the RMAN recovery catalog， which contains the RMAN metadata for the target database
D set the database ID （DBID）， but only if the DB_NAME parameter associated with the target database is unique in the recovery catalog
正确答案
答案解析
略
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